package io;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 *
 */
public class CopyDemo2 {
    public static void main(String[] args) throws IOException {
        FileInputStream fis=new FileInputStream("美女图片.webp");
        FileOutputStream fos=new FileOutputStream("美女图片_cp0.webp");

        /*
        long start=System.currentTimeMillis();
        byte[]data=new byte[1024*10000];
        while (fis.read(data)!=-1){
            fos.write(data);
        }
        long end=System.currentTimeMillis();
        System.out.println("复制完毕！耗时"+(end-start)+"ms");

        fis.close();
        fos.close();

         */
        long start=System.currentTimeMillis();
        byte[]data=new byte[1024*10];
        int len;
        while ((len=fis.read(data))!=-1){//每次读取10KB并判断是否到达结尾
            fos.write(data,0,len);
        }
        long end=System.currentTimeMillis();
        System.out.println("复制完毕！耗时"+(end-start)+"ms");

        fis.close();
        fos.close();

    }
}
